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Tax Center / Glossary

Tax Glossary

Common tax terms explained in plain language.

Adjusted Gross Income (AGI)
Your total gross income minus specific deductions (such as student loan interest and IRA contributions). AGI is used to determine eligibility for many credits and deductions.
Enrolled Agent (EA)
A tax professional licensed by the IRS to represent taxpayers in audits, collections, and appeals.
Estimated Tax
Quarterly payments made during the year on income not subject to withholding (self-employment, investments, etc.).
Extension (Form 4868)
A request for additional time to file your return. An extension to file is not an extension to pay — tax owed is still due by the original deadline.
Filing Status
Your category for tax purposes: Single, Married Filing Jointly, Married Filing Separately, Head of Household, or Qualifying Surviving Spouse.
Itemized Deductions
Specific deductible expenses (mortgage interest, state taxes, charitable gifts, etc.) listed on Schedule A instead of taking the standard deduction.
Offer in Compromise (OIC)
An IRS program allowing eligible taxpayers to settle tax debt for less than the full amount owed.
Self-Employment Tax
Social Security and Medicare taxes paid by self-employed individuals, calculated on Schedule SE.
Standard Deduction
A fixed dollar amount that reduces taxable income. Available to most filers who do not itemize.
Tax Bracket
A range of income taxed at a specific rate. The U.S. uses a progressive system — not all income is taxed at your top rate.
W-2
Form reporting wages and taxes withheld by an employer, furnished to employees by January 31.
1099-NEC
Form reporting nonemployee compensation of $600 or more paid to independent contractors.
Withholding
Income tax deducted from paychecks and sent to the IRS on your behalf by your employer.